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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Gas Processing Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Carbon Dioxide,Hydrogen sulfide,Nanofluid,Wetted Wall Column,Diethanolamine,Nanoporous Graphene
- چکیده:
- چکیده انگلیسی: In this study, it was shown that how CO2 and H2S were removed from a natural gas stream, using a nanofluid containing nanoporous graphene in Diehanolamine (DEA). Before running the experiments, the appropriate values were chosen for the nanosheet dosage and the liquid and gas flow rates in the absorption experiments, which were performed in a laboratory scale wetted wall column. In the experiments, the nanosheet concentration ranged from 0.005 to 0.5 wt %.The surfactants and ultrasonic treatment were used to prepare stable nanofluids. It was indicated that using nanoporous graphene in DEA significantly affects on CO2 and H2S absorption in comparison to DEA. The absolute zeta potential values of nanofluids were greater than +35 mV. The effect of different parameters including nanosheet concentration as well as the CO2 and H2S concentration, in the feed gas stream (two different samples) on simultaneous absorption of H2S and CO2 from CO2-H2S-CH4 gas mixture was studied. In the case of using sample #1, (i.e. Feed gas mixture composition: % H2S and 3% CO2 in balance of CH4), an improvement in CO2 absorption to 39% and H2S absorption to 9% was observed at 0.1 wt% of nanoporous graphene/DEA nanofluids.
- انتشار مقاله: 11-10-1394
- نویسندگان: Ali Mohebbi,Mahboobeh Taheri,Hassan Hashemipour,Ali Morad Rashidi
- مشاهده
- جایگاه : پژوهشی
- مجله: Interdisciplinary Journal of Virtual Learning in Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Smart Schools,Technology Acceptance,TAM model
- چکیده:
- چکیده انگلیسی: Background: The rapid growth of information and communication technology has brought about substantial changes in educational practices and approaches. Education and training have received more attention in view of technological developments and emerging requirements. The aim of this study was to investigate school principals’ application of Technology Acceptance Model (TAM) in smart schools of Qom, Iran. Methods: This was a descriptive-correlational study. The study population included all smart school principals in Qom in 2018. Purposeful sampling was applied to identify and select 70 principals as the participants of the study. Davis’ TAM questionnaire with a reliability coefficient of 0.78 was used for data collection. Descriptive statistics, including mean and standard deviation, were calculated for data analysis, and Pearson correlation coefficient was used in the inferential analysis. Results: Significant positive relationships were observed between perceived usefulness and attitude towards the use of technology (r=73, p <0.01), perceived usefulness and willingness to use technology (r=64, p <0.01), perceived ease of use and attitudes towards the use of technology (r=39, p <0.01), perceived ease of use and perceived usefulness of technology (r=43, p <0.01), and finally the tendency to use and actual use of technology (r=63, p <0.01). Conclusion: In order to improve the performance of smart schools, it is recommended to cultivate a positive and constructive attitude towards technology among principals and teachers in a dynamic way.
- انتشار مقاله: 24-02-1399
- نویسندگان: Shahram Mehravar Giglou,Ali Rashidi,Zahra Manidari
- مشاهده
- جایگاه : پژوهشی
- مجله: Interdisciplinary Journal of Virtual Learning in Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی: Introduction Positive psychology interventions with focus on strengths of individual, is one of the new approaches in helping people due to develop their ability and emits .the aim of this study was to determine the effectiveness of positive thinking skills on academic procrastination of high school female students. Methods Research type was semi-experimental, pretest-posttest design with control group. Population was all female high school students in 3 section education organization Kermanshah city, 2014-2015. The research sample included 120 female from 22 Bahman high school students who were selected through multistage random cluster sampling method and then based on entrance and existence criteria assigned into two groups (experimental and control) randomly. The instruments used were academic procrastination Scale (validity = 0.65 & reliability = 0.83). The positive thinking skills intervention included 8 sessions, each 90 minutes, twice in week for experimental group. Because of effectiveness these interventions sessions were applied for control groups after posttest. Data analyzed with analysis of covariance using spss-21. Results The results showed that positive thinking skills is effective on academic procrastination of high school female students (P ≤ 0.001). Conclusions Regarding the divergences between two groups' positive skills training scan be effective in reducing procrastination. Findings indicated the necessity of applying positive thinking program training in schools due to reducing academic procrastination and increasing success and progress of their academic performance in students.
- انتشار مقاله: 11-10-1348
- نویسندگان: Somayeh Moradi,Alireza Rashidi,Mohsen Golmohammadian
- مشاهده
- جایگاه : پژوهشی
- مجله: Reviews in Clinical Medicine
- نوع مقاله: Journal Article
- کلمات کلیدی: Infant,Malnutrition,Newborn,fetal,Growth Chart
- چکیده:
- چکیده انگلیسی: Several complications during childhood is associated with nutritional status of infants at birth. Therefore, nutritional status of newborns must be evaluated properly after birth. Assessment of the nutritional status of neonates based on anthropometric and physical indices is simple and inexpensive without the need for advanced medical equipment. However, no previous studies have focused on the assessment methods of the nutritional status of infants via anthropometric and physical indices. This study aimed to review some of the key methods used to determine the nutritional status of neonates using anthropometric and physical indices. To date, most studies have focused on the diagnosis of fetal malnutrition (FM) and growth monitoring. In order to diagnose FM, researchers have used growth charts and Ponderal index (PI) based on anthropometric indices, as well as Clinical Assessment of Nutritional (CAN) Score based on physical features. Moreover, in order to assess the growth status of infants, growth charts were used. According to the findings of this study, standard intrauterine growth curves and the PI are common measurement tools in the diagnosis of FM. Furthermore, CAN score is widely used in the evaluation of the nutritional status of neonates. Given the differences in the physical features of term and preterm infants, this index should be adjusted for preterm neonates. Longitudinal growth charts are one of the most prominent methods used for monitoring of the growth patterns of infants.
- انتشار مقاله: 14-02-1395
- نویسندگان: Ali Asghar Rashidi,Abdolreza Norouzy,Bahare Imani,Mohsen Nematy,Mohammad Heidarzadeh,Ali Taghipour
- مشاهده
- جایگاه : پژوهشی
- مجله: Reviews in Clinical Medicine
- نوع مقاله: Journal Article
- کلمات کلیدی: Infant,Malnutrition,Newborn,fetal,Growth Chart
- چکیده:
- چکیده انگلیسی: Several complications during childhood is associated with nutritional status of infants at birth. Therefore, nutritional status of newborns must be evaluated properly after birth. Assessment of the nutritional status of neonates based on anthropometric and physical indices is simple and inexpensive without the need for advanced medical equipment. However, no previous studies have focused on the assessment methods of the nutritional status of infants via anthropometric and physical indices. This study aimed to review some of the key methods used to determine the nutritional status of neonates using anthropometric and physical indices. To date, most studies have focused on the diagnosis of fetal malnutrition (FM) and growth monitoring. In order to diagnose FM, researchers have used growth charts and Ponderal index (PI) based on anthropometric indices, as well as Clinical Assessment of Nutritional (CAN) Score based on physical features. Moreover, in order to assess the growth status of infants, growth charts were used. According to the findings of this study, standard intrauterine growth curves and the PI are common measurement tools in the diagnosis of FM. Furthermore, CAN score is widely used in the evaluation of the nutritional status of neonates. Given the differences in the physical features of term and preterm infants, this index should be adjusted for preterm neonates. Longitudinal growth charts are one of the most prominent methods used for monitoring of the growth patterns of infants.
- انتشار مقاله: 14-02-1395
- نویسندگان: Ali Asghar Rashidi,Abdolreza Norouzy,Bahare Imani,Mohsen Nematy,Mohammad Heidarzadeh,Ali Taghipour
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Nanoanalysis
- نوع مقاله: Journal Article
- کلمات کلیدی: nanocatalyst,Graphene,MCM-41,CVD method
- چکیده:
- چکیده انگلیسی: Graphene films were fabricated over synthesized MCM-41 nanocatalyst by chemical vapor
deposition method, and the reaction was carried in atmospheric pressure at 750˚C. Acetylene
gas used as a carbon precursor and the synthesis reaction took place in hydrogen atmosphere.
Mesoporous MCM-41 was synthesized at room temperature, using wet chemical method. The
synthesized metal free catalyst was characterized by XRD and N2 adsorption isotherms. The
catalytically synthesized graphene layers were characterized by Raman spectroscopy, scanning
electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicated
that the favorable effect of MCM-41 with high BET surface area (908.76 m2/g) as an active
metal free nanocatalyst for fabricating graphene layers with high level of purity and homogeneity.
Because of simplicity, easy purification, and high yield of graphene synthesis offered by
this method, it is possible to use it in larger scales.- انتشار مقاله: 04-03-1397
- نویسندگان: Majid Masoumi,Ali Morad Rashidi,Mohammadmehdi Choolaei,Saeed Sadeghpour
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of System Management
- نوع مقاله: Journal Article
- کلمات کلیدی: Human Factors,Organizational Agility,organizational factors,Technological factors,Strategic Factors
- چکیده:
- چکیده انگلیسی: Nowadays, organizational agility is a subject that its study has a significant impact on the growth and improvement of organizations. The present research is carried out in order to design and explain an organizational agility development model for the North Khorasan province's organization of education. Present research in terms of purpose is applied and in terms of methodology is descriptive-exploratory. According to the theoretical hypotheses explained in the research, organizational, strategic, human, and technological factors were identified in this research as the factors explaining the organizational agility development model for the North Khorasan province's organization of education. In order to explain the research model, a standard questionnaire, developed by Sharifi and Zhang (2001), was used. The Cochran formula was used to determine the sample size and the sampling method was stratified random sampling. To analyze data, descriptive and inferential statistics methods were used so that in the inferential part, confirmatory and exploratory factor analysis tests using SPSS and LISREL were used. The results obtained from the statistical analysis at the descriptive level demonstrated that average of organizational agility, human, organizational and strategic factors are greater than the average level and average of technological factors is at the average level. At the inferential level, which used confirmatory factor analysis, the results indicated that organizational, human, strategic, and technological factors are influential on the organizational agility development. Thus, this study develops an organizational agility model based on the aforementioned factors
- انتشار مقاله: 05-10-1397
- نویسندگان: Mohammadvali Rashidi,Moslem Cherabin,Ahmad Akbari,Ali Maghool
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Optimization in Industrial Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Genetic Algorithm,Gender separation,School bus routing problem,mixed integer mathematical programming,Mix loading
- چکیده:
- چکیده انگلیسی: In developing countries, whereas the urban bus network is a major part of public transportation system, it is necessary to try to find the best design and routing for bus network. Optimum design of school bus routes is very important. Non-optimal solutions for this problem may increase traveling time, fuel consumption, and depreciation rate of the fleet. A new bus routing problem is presented in this study. A multi-objective mixed integer model is proposed to handle the associated problem. Minimization of transportation cost as well as traveling time is the main objectives. The main contributions of this paper are considering gender separation as well as mixed-loading properties in the school bus routing problem. Moreover, special and handicapped students are considered in this problem. The proposed model is applied in a real case study including 4 schools in Tehran. The results indicate the efficiency of the proposed model in comparison with the existing system. This comparison shows that the students’ travelling time is reduced by 28% for Peyvand middle smart school, 24% for Tehran international school, 13% for Hemmat School and 21% for Nikan High school. A customized Genetic Algorithm (GA) is proposed to solve the model. Penalty functions are used to handle the several constraints of the problem in Genetic Algorithm. The results justify the applicability and efficacy of the both proposed model and solution approach.
- انتشار مقاله: 28-10-1398
- نویسندگان: Alireza Rashidi Komijan,Peiman Ghasemi,Kaveh Khalili-Damghani,Fakhrosadat HashemiYazdi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Optimization in Industrial Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Delphi method,Road map,Quantum computing,proposed model,Emerging sciences
- چکیده:
- چکیده انگلیسی: One of the solutions for organizations to succeed in highly competitive markets is to move toward emerging sciences. These areas provide many opportunities, but, if organizations do not meet requirements of emerging sciences, they may fail and eventually, may enter a crisis. In this matter, one of the important requirements is to develop suitable roadmaps in variety fields such as strategic, capability, product, technology and etc. In this subject, it should be mentioned that there are connections among types of roadmaps, therefore, organizations need to understand these relations. According to this, we propose a model which describes relations among the roadmaps based on braid theory and appropriate methods for developing those roadmaps. The validity of developed model was conducted through the Delphi method. Additionally, we illustrate a to design a roadmap and implement it in quantum computing as an emerging science.
- انتشار مقاله: 02-09-1397
- نویسندگان: Abolghasem Sharayei,Mahmood Alborzi,Reza Radfar,Ali Jabbar Rashidi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Nanostructures
- نوع مقاله: Journal Article
- کلمات کلیدی: Hydrothermal Method,Oxidative dehydrogenation,Nanostructured vanadium catalysts,porous grapheme,amine framework
- چکیده:
- چکیده انگلیسی: In this study at first, in laboratory, three types of vanadium oxide were produced by using porous graphene and amine framework in hydrothermal method nanostructures such as: vanadium oxide - octadecyl amine - graphene, vanadium oxide - dodecyl amine - graphene and vanadium oxide – aniline - graphene (V-ODA-G، V-DDA-G، V-A-G). Then their structures and functions in propane dehydrogenation reactions were studied and productivity and efficiency of these catalysts in mentioned reactions were compared with each other. In order to notice and compare the structures and properties of synthesized catalysts, some methods such as Field Emission Scanning Electron Microscope (FE-SEM), X Ray Diffraction (XRD), Thermo Gravimetric Analysis (TGA), Fourier Transform Infrared Spectrometry (FTIR), Gas Chromatography (GC) have been used. The obtained results show that vanadium oxide nanostructures have great opportunities to be oxidatively dehydrogenation (ODH) and make sciences explore the use of porous grapheme as catalysts for propane oxidative dehydrogenation.
- انتشار مقاله: 05-07-1397
- نویسندگان: Abdollah Fallah Shojaei,Alimorad Rashidi,Mina Ghias,Robabeh Mousavi
- مشاهده